Exercise stool or similar article



FIG. 1 is a front elevational view of an exercise stool or similar article showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an exercise stool or similar article, substantially as shown and described. 